Chiharu Mitsuha returns to her in-laws' countryside home for summer vacation. The rural air offers a refreshing change from city life, filling her with hopeful anticipation. However, overwhelmed by the demands of caring for her father-in-law, she is suddenly overpowered and forcibly taken by him. The traumatic experience leaves deep emotional scars. Unable to endure loneliness any longer, he becomes consumed by desire for his young, beautiful, and innocent daughter-in-law, taking her again. Drowning in pleasure, the two spiral into an increasingly intense and forbidden relationship. Dominated by raw passion, they repeatedly entwine in sweaty, fervent embraces.